05 C90T Starting Problem, Maybe Compression Lock
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  1. #1
    Newbie
    My Bike(s)
    Boulevard C90T
    Location
    Central Coast, CA
    Posts
    1

    05 C90T Starting Problem, Maybe Compression Lock

    Have had my Blvd for 3 years and about 7K miles. It has had a chronic albeit infrequent problem with getting locked up on restart after being ridden for varying lengths of time. Sometimes seems to have a relationship with very hot weather but not always. At first, I thought it was a battery problem but after experiencing it about a dozen times over three years, I have decided it is more of a compression lock problem. By that I mean that the battery tries to turn it over quite well but it "immediately" hits a strong compression stroke that it can't overcome. My theory is that there are times that it just happens to stop at the point of the 4 cycle stroke where some compression has started to build. When very hot, this trapped air might even gain in compression while first sitting and it just doesn't have the power in the battery and starter to overcome it. The fix, I have discovered, is to simply let the bike sit for about 15 to 30 minutes over which time I suspect the compression bleeds down and then, usually by rapidly engaging the starter repeatedly, it will finally turn over easily and start right up.

    Is anyone else having a similar problem or a suggestion for a possible fix?

    PS -

    After several replies re the battery, I will add that I have already installed a brand new battery as a precaution, ride on a regular basis which keeps it charged well and when the problem occurs, even using jumper cables from a known more powerful battery does not get it to turn over so I don't think the battery is the problem. I will check the cables and starter. Anyone know a way to check the torque of the starter or does one just have to put a new one on if all else checks out OK?
    Last edited by calflyer; 08-29-2008 at 10:06 AM. Reason: Add more details

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  3. #2
    Super Moderator

    My Bike(s)
    Can-AM Spyder
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    Ocala, FL
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    Quote Originally Posted by calflyer View Post
    Is anyone else having a similar problem or a suggestion for a possible fix?
    Your analysis may be (mostly) correct BUT if everything is up to snuff, it should NOT do what you are describing.

    Something is causing the starter torque to be low......just low enough that it only fails under maximum strain.

    Could be:
    Bad connection at one end of a main battery cable.
    Bad ground connection at the starter.
    Battery that is just a tad weak.
    Bad starter.
    Bad solenoid or relay.

    If you haven't changed the battery in 3 years, I would start there.....and check the cables carefully at the same time. A new battery must be charged fully before installation.
    Don't believe everything that you think.

  4. #3
    Just Won't Go Away !
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  6. #4
    Super Moderator

    My Bike(s)
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    Quote Originally Posted by frostbitevinnie View Post
    Good article......even if the C90 doesn't have one of those things.....does it ??

    Last line:
    "The trick to working with decomp adjustment is to make sure that you really DON'T have a dead battery first!! "
    Don't believe everything that you think.

  7. #5
    Newbie
    My Bike(s)
    Suzuki Boulevard C90T
    Posts
    3

    C90 Hard Start

    Hey CalFlyer, I've had the same problem on my "07" C90. Did not notice the cams when I changed the plugs but,,,I had posted the problem a week ago and had received the suggestion to try rocking the bike backwards in second gear the next time I had the problem. Well, it would not start a few days ago and I tried that and the bike emmediately fired. I'll have to try it one more time and if I get similiar results will have to take it in to the dealer "again" and let them know what I found out. Maybe the C90 has a different set-up for the decompression valve?

  8. #6
    Just Won't Go Away !
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    Quote Originally Posted by waybro View Post
    Hey CalFlyer, I've had the same problem on my "07" C90. Did not notice the cams when I changed the plugs but,,,I had posted the problem a week ago and had received the suggestion to try rocking the bike backwards in second gear the next time I had the problem. Well, it would not start a few days ago and I tried that and the bike emmediately fired. I'll have to try it one more time and if I get similiar results will have to take it in to the dealer "again" and let them know what I found out. Maybe the C90 has a different set-up for the decompression valve?
    It is a common issue with our bikes. Easy fix so don't waste your time going to the stealership.

  9. #7
    Newbie
    My Bike(s)
    '05 Suzuki Boulevard C90
    Location
    Central Californiacation
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    12
    Very common problem with our C90s. IF, when you do the "Suzuki Shuffle" ie; rocking it backwards it starts it's a sure bet you need to adjust the decomp cams. Easy adjustment with just basic tools. Check out: Decomp Valve Adjustment for GOOD detailed instructions. Had the same problem with my '05 C90 and this solved the problem!!! Good luck..... ride safe

  10. #8
    Just Won't Go Away !
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    several
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    Yes, the C90 and the 1500 LC have the same decomp system.
    You MUST obey the pug dog!


  11. #9
    Just Won't Go Away !
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    Quote Originally Posted by calflyer View Post
    Have had my Blvd for 3 years and about 7K miles.
    3 years and 7K???? Maybe that's the problem with the bike, not ridden enough. I think I put on 7K this season by July.

  12. #10
    Newbie
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    2004suzuki vz 1600
    Location
    new york
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    20
    sometimes when the brushes on the starter are bad or worn and it is hot you will get the same symptoms when the bike is cool does it start

  13. #11
    Newbie
    My Bike(s)
    2005 Boulevard C90T
    Location
    Fremont, IN
    Posts
    5

    Starting problems

    I posted this elsewhere, but this is where I started so please bear with me. I have had the same very intermittent problem, always a long way from home. Multiple tries with starter switch finally worked, didn't know about rocking. Any other diagnostics? Also put hard chrome pipes 2 into 1 on my 90T and love them, but they obscure oil level view, and make adding oil very difficult...put on by dealer 3 years ago...any ideas about cures. Problems are due to routing of the pipes and removal 'nuts' etc. Thanks!

  14. #12
    Just Won't Go Away !
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    Ahhhh, now we know that your bike is not a Schwinn. The C90T is pretty infamous for AM pipes blocking the site glass and making adding oil a PITA. Get yourself a ball end allen, can't remember the size 6mm or 5mm??, and grind off the short end to about 3/8". This will allow you to get in there and turn the allen bolt a bit. Also get yourself a pair of long, curved needle nose pliers to finish turning the bolt, put a rag on your pipes to avoid scratching. Wallaahh, now you have it. As far as checking the oil level either get a mirror or have someone, preferably a competent rider, to sit on the bike while you check the level.

    If you don't want to do this I would gladly sell you my stock pipes for a fair price and your problem will be completely solved.

    Starting problem sounds like a decomp issue.

  15. #13
    Newbie
    My Bike(s)
    2005 Boulevard C90T
    Location
    Fremont, IN
    Posts
    5

    Vinnie

    Thanks for the feedback, especially on the oil view etc. Appreciate stock pipes offer, but still have my own. Keep the shiney side up! Quicksilver.

  16. #14
    Newbie
    Posts
    1
    I have a 2006 C90 and was experiencing the same thing. It turned out to be the starter relay loacated under the tank skin on shifter side of bike. It had me baffled because I could hear the relay click and feel it switch when I hit the starter but no start. I jumped the power cables going in/out of the relay and the starter turned. I got a new starter relay off Ebay for about $15 shipped and it works great! Before you go messing with your decompress system, check your battery and relay.

  17. #15
    Super Moderator

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    Good advice.
    Welcome to the forum.
    Don't believe everything that you think.


 

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